A terrorist "over there" arms himself with an insect that enjoys human flesh; alternate Olivia is reunited with her boyfriend; despite remaining determined to save his world, Walternate discovers there are lines he won't cross.

Back "over here,” the Fringe Division investigates a bizarre phenomenon when 15 people up and down the Eastern Seaboard, all suffer retrograde amnesia from listening to their shortwave radios on the same frequency.